Chemical Process
In the Lurgi coal gasifier

Large quantity of coal can be processed
Entrainment of solids is higher
Low carbon conversion efficiency is achieved
Coking coals cannot be used

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Chemical Process
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

Its calorific value is very less
All of these
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Tar neutralises the residual acids present in pitch

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